Last lathe



May 5, 1925. 1,536,721

- s. B. MAGOON LAST LATHE Filed June 27. 1922 3 Sheets-Sheet 1 May 5, 1925. 1,536,721

G. B. MAGOON LAST LATHE May 5,1925

G. B. MAGOON LAST LATHE Filed June 2'7. 1922 3 Sheets-Sheet 3 Patented Wiley 5, 1925.

GEORGE E. MAGOON, OF WORCESTER, MASSACHUSETTS.

LAST LATHE.

Application filed June 27, 1922.

To all 101 mm may concern:

Be it known that I, Gnonen B. MAGooN, a citizen of the United States, residing at )Vorcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Last Lathe, of which the following is a. specification.

This invention relates to a last lathe and particularly to anew construction and arrangement of the cutter and pattern roll in. such a lathe.

In the form of last lathe commonly used, cutters and pattern rolls of relatively large diameter are mounted to rotate about axes parallel to the axes of rotation of the pattern and the last block. These large cutters and pattern rolls are found to be incapable of accurately reproducing certain desired concave surfaces of short radius and, abrupt curvature,

It is the general object, of my invention to provide, a last lathe in which, a cutter and preferably also. a. pattern roll of relatively small diameter are used, the cutter rotating about a substantially vertical axis while, in, the preferred form, the pattern roll rotates about a horizontal. axis.

An important feature of my invention relates to the provision of; a. cutter and pattern roll. each of substantially spherical form and of relatively small diameter.

Further. features of my invention relate to an independent motor drive for the cutter head, and to arrangements and com-binationsof, parts which will be hereinafter described andmore particularly pointed out in the appended claim.

A preferred form of my invention is shown inthe drawings in which? Fig. 1 is a front elevation of a last lathe embodying my improvements;

Fig, 1 is a detail sectional plan view, taken along the line 11- in Fig. 1;

Fig, 2 is a sectional elevation, taken along the line 2-2 in Fig. 1;

Fig. 2? is a detail sectional plan view of the cutter head, taken along the line 2.2 inFig. 2;

Fig. 3 is a partial sectional plan view of the cutter head andcarriage, taken along the line 33 in Fig. 2;

Fig. 4 is asectional side elevation, taken along the line 4-4 in Fig. 1 and showing the pattern roll and its supporting and controlling devices, and,

Serial No. 571,161.

guideway 13 (Fig. 2) in its lower front surface which cooperates with a V-shaped rib or guide 14 fixed on the frame 10. The cutter carriage 12 has a similar inverted guide-way 15 slidable on a guide 16 on the frame 10. At the rear portion of the sup port and also of the carriage, there are flat bearing surfaces resting upon a guide bar 1.? at the rear of the frame 10.

The cutter carriage 12 is provided with a rack bar 18 engaged by' a gear 19' which meshes with a pinion 20 on the. rear of a short horizontaP shaft 21. A worm wheel 22 (Fig. 1) is secured" to the front end of the shaft 21 andis rotated by a worm 23 on a feed shaft 24'. The shaft2i may be driv en in any convenient manner as by a. belt 25 and pulley 26.

The shaft 24 is partially sup-ported in a bearing 27 which is pivoted on the frame 10. The free swinging'end of theshaft 24 is provided with a sleeve or hearing 28'having a link or rod 29conneeted thereto. The rod 29 is provided with a notch 30 near its upper end adapted to receive the end of a latch bar 31 slidable on the frame 10. A SIHlllg 32 assists in yieldingly depressing the rod 29 to disengage the worm 23-from the worm wheel 22. A second spring 33 engages a lug 34 on the side of thesliding bar 31, and yieldingly presses the bar 31 into the notch 30 of the linlt29.

vA hand lever 35 (Fig. 1) is mounted on a fixed pivot 36 and projects into a notch in the link or rod29. 1V hen the hand lever 35 is depressed, the link 29 willbe' raised, causing'the worm 23' to engage the worm wheel 22. The spring 33 will th'en'move the sliding bar 31 into the notch 30, thus holding the worm in driving engagement with the. worm wheel.

An adjustable lock or stop 37 (Fig. 1) is secured to the sliding bar. 31 in position for engagement by the end of the support 11 as it, is moved to the left along its guide-14 lVhen the stop is thus engaged, the bar 31 is withdrawn, the link 29 is released, and the spring 32 forces the link downward to disengage the worm and stop the feed.

The sliding movement of the pattern roll support 11 is derived froin the movement of the carriage i2 and is proportional thereto. For this purpose, a lever is pivoted at 40* on the support 11 and is slotted to slide on a pin 41 on a brace 42 supported by the frame 10. An adjustable link 43 (Fig. 1 is connected at one end to a stud on the carriage 12 and at the other end to a plate 46 slidab-le lengthwise of the lever 40- and secured in adjusted position thereon by a clamp 47 (Fig. 1). By varying the vertical adjustment of the plate 36 on the lever 40, the longitudinal movement of the pattern roll may be made either greater or less than the longitudinal move ment of the cutter but always proportional thereto. The relative longitudinal position of the roll and cutter may be varied by adjusting the length of the link 43.

The pattern or model 50 is mounted between dead center 51 and a driving spindle 52. The spindle 52 is connected by a gear 53 and pinion 54 to a drive shaft 55 which may be rotated by a belt 56 and pulley 57. he spindle 52 and shaft 55 are supported in bearings in a frame 58 which is mounted to swing about pivots 59 mounted on fixed supports not shown in detail. The lastblock 60 is similarly supported between a dead center 61 and a driving spindle 62 connected by a gear 63 and pinion 64 to the drive shaft 55. The pattern 50" and last block 69 are thus simultaneously rotated at equal speeds about the same or parallel horizontal axes.

The pattern roll 65 (Fig. 5) is shown as of substantially spherical form and as rotatable upon a stud 66 secured to a bracket 67. The bracket (37 is pinned to a block (18 and the bracket and book. are secured to the slide 69 by a bolt 70 extending through a slot in the bracket and block. A stop screw 71 may be used for adjusting the block 68 on the slide 69. The slide 69 is mounted for forward and rearward movements on a guide 69 (Fig. 4) on the pat tern roll support 11.

A contact blade 72 (Fig. 4) is mounted in a carrier 73 which may be adjusted vertically in guide-ways at the rear end of the slide 69 by means of an adjusting screw 74. The screw 74 is connected by bevel gears 75 and a shaft 76 to a hand wheel 77 mounted above the support 11. A relatively heavy spring 78 is secured at one end to a hook 79 fixed to the support 11 and at the opposite end to a hook 80 on the slide 69. The slide is thus forced yieldingly rearward, causing the contact blade 72 to engage a so-called fan board 81 mounted on fixed horizontal pivots and having an upwardly projecting arm 82 connected by an adjustable link 83 to the swinging frame 58 on which the pattern and last block are rotated. The connection of the link 83 to the arm 82 is made through a block 84 which is adjustable lengthwise of the arm 82.

The object of providing the slide 69, the contact blade 72, the fan board 81 and the adjustable connections from the fan board to the swinging frame 58 is to permit a single pattern to be used for cutting lasts of different widths. If the blade 72 is adjusted to the exact center of angular movement of the fan board 81, engaging the board substantially at its axis, there will be no forward or rearward movement of the slide 69 and the last produced will be of the same width as the pattern. If, however, the blade 72 engages the board 81 above or below its axis, the width of the last will be correspondingly increased or decreased. The parts thus far described with the exception of the pattern roll 65 and its connections to the slide 69, while essential to a clear understanding of my invention, form no partthereof and are in common commercial use.

My improved cutter and the driving mech anism therefor are shown in Figs. 2, 2 and 3. The cutter is formed of a plurality of blades clamped together and secured by a nut 91 to the upper end of a spindle 92. This spindle is rotatable in upper and lower bearings 93 and 94 which are preferably of the ball thrust type. A fly wheel 95 is secured to the lower end of spindle 92 to increase the steadiness of movement thereof and a small pulley 96 between the bearings 1 is connected by a quarter turn belt 97 to a driving pulley 98 on the armature shaft 99 of a motor 100.

The motor is suspended from a depending projection 101 on the carriage 12 which supports the guide pulleys 102 and 103 (Fig. Conical washers 104; (Fig. 2) are mounted on the spindle 92 below the ball bearings 93 and 9 1- and act to conduct any oil or grease escaping therefrom into grooves or recesses 105 in the fixed bottom members of the bearings. The oil is thus kept from engagement either with the belt 97 or with the fly wheel 95, by either of which it might be thrown against the work, discoloring and injurying the product of the machine.

The cutter blades 90 are preferably interchangeable and are each formed with a segmental curved cutting portion at one end and a threaded shank at the other end. Each threaded shank extends through an opening in the body of the next adjacent blade and is secured therein by a nut- 90*. The cutters are thus securely clamped about the square portion of the shaft 92. A collar or washer 91 may be forced against the cutter shanks by the nut 91, holding them tirml v against a shoulder on the shaft. The cutter head tlms comprises a small number ot simple duplicate parts and may be easily and cheaply made and repaired.

Having thus described my invention, it will be seen that l have provided an indep ndent and sell' contained drive for the cutter, all parts being mounted upon the cutter carriage. I am thus able to omit the large drmn and belt c mnections hereto'lm'e commonly used for driving the cutter.

I have also provided a cutter mounted up on a vertical axis so that the cut is made with the grain instead 01 across the grain and l. have provided a cutter and pattern roll both of substantially spherical form and capable of accurately following concave surfaces of very short radius. The spherical form of the cutter and roll also permit me to mount the pattern roll upon a horizontal axis so that it will roll in contact with the pattern while at the same time the cutter mounted upon a vertical axis will nevertheless Follow the movements ol' the pattern roll and accurately reproduce the pattern.

The particular form of cutter is not claimed in this application as it forms the subject matter of a divisional application, Serial No. 191,136, filed, March 28, 1925.

Having thus described my invention and the advantages thereot', I do not wish to be limited to the details herein disclosed other wise than as set forth in the claim, but what I claim is:

In a last lathe, a fixed base, a frame pivotally mounted for angular movement about a horizontal axis relative to said base, said frame rotatably supporting a pattern and a last block with their axes parallel to the piv-- otal axis of said frame, means to simultane ously rotate said pattern and said last block, a carriage mounted on said fixed base for sliding movement parallel to tl axis ol said pattern and last block, a cutter shat't vertically mounted in bearings in said carriage, a ball-shaped cutter mounted on said cutter shaft and having its cutting edges tormed substantially as arcs of a sphere zentered on said shaft, a ball-shaped pattern roll substantially equal in size and curvature to said cutter, and a support for said roll on said carriage, said roll being mounted tor rotation about a horizontal parallel to the axes o1 said pattern and last block and said pattern and last block being); simultaneously movable toward and from said roll and cutter by rolling contact o'l said roll and pattern.

In testimony whereof I have hereunto a'ltixed my signature.

GEORGE E. MAGOON. 

